IRAP > Séminaires > Calendrier des séminaires > Why young, doomed hot Jupiters are easier to catch than old ones

Why young, doomed hot Jupiters are easier to catch than old ones

Séminaire le 07 juin 2018 de 11h00 à 12h00

Intervenant : Andrew Collier Cameron

University of Saint Andrews

Salle Lyot Salle Lyot

Massive planets in close orbits around their host stars undergo tidal orbit decay at a rate that increases with planet mass and proximity to the host star. The upper left-hand corner of the mass-separation diagram is visibly depleted as a result. By modelling the underlying population it’s possible to calibrate the strength of the tidal interaction from the location of the boundary. The model also reveals that the probability of seeing a planet today depends on how much its migration has speeded up since birth, as well as the probability density for its birth location. Batches of planets formed recently at a given location haven’t yet been spread out by the accelerating flow, whereas older batches from further upstream have a more thinly-spread probability density. I’ll show how this explains some curious features of the hot-Jupiter population and their host stars.

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